tools thermal tmon: Use -O3 instead of -O1 if available

Using -O3 instead of -O1 if it's supported by compiler.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Markus Mayer <mmayer@broadcom.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Link: http://lkml.kernel.org/r/20190103161350.11446-2-jolsa@kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>